Hallo,

here is a new paper about a tag inside an eel inside a whale:



Wahlberg, M., H. Westerberg, K. Aarestrup, E. Feunteun, P. Gargan, D. Righton 
(2014). Evidence of marine mammal predation of the European eel (Anguilla 
anguilla) on its marine migration. Deep-Sea Research Part I 86:32-38.

Abstract
Temperature and depth logging tags were implanted into adult eels released on 
Atlantic west coasts of France and Ireland to study their oceanic migration 
behavior. For three of the tags, 25 to 256 days after release there was a 
dramatic rise in temperature from 10°C to 36°C and the dive profile changed 
from depths of 300-1000 m to repeated ascents to the surface. This indicated 
that the eels carrying the tags had been eaten by a mammalian predator. Two of 
the tags had sufficient sampling rate to resolve the dives in detail. They 
recorded a total of 91 dives to maximum depths of 250-860 m lasting 11-12 min 
and with surface intervals of 5-7 min. More than two thirds of the dives 
included a rapid descent from approximately 500 m to 600-700 m. From this we 
infer that the predator was most likely a deep-diving toothed whale. The dives 
logged while the tags were inside the predator revealed that the temperature 
usually decreased during dives, and increased again during surface periods. The 
temperature drops during dives were probably caused by the ingestion of prey or 
water. These observations provide insights into the behavior of toothed whales 
foraging in the mesopelagic zone.

The paper is available at: 
http://www.sciencedirect.com/science/article/pii/S0967063714000077

Magnus Wahlberg



Marine Biological Research Centre

University of Southern Denmark

Hindsholmsvej 11

5300 Kerteminde

Denmark



http://www.sdu.dk/en/om_sdu/institutter_centre/i_biologi/forskning/marinbiologisk+forskningscenter


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